Circuit controller for lens-drilling machines



Feb. 23 1926. 1,574,571

E. E. GRAY dm'cun- CONTROLLER FOR mus DRILLING umcnmzs Filed Oct. 21, 1922 Patented Feb. 2 3, me.

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EVERETT E. GRAY, OF LOS ANGELES, CALIFORNIA.

CIRCUIT CONTROLLER FOR LENS-DRILLING MACHINES.

Application filed October 21, 1922. Serial No. 595,999.

a drill shaft supporting carriage which is adjustable to vary the position of a drill with relation to a piece of work, a lever which is manually operable to adjust the carriage, and electrical means for actuating the drill shaft irrespective of the adjustment of the carriage.

It is a purpose of my invention to provide a circuit controller for the electrical means of a drilling machine of the above described character which operates to'render the electrical means active when the carriage is moved from its normal position, the construction of the circuit controller being such as to-allow of the required adjustment of the drill carriage to move the drill into and out of contact with the lens at frequent intervals as is the custom, yet maintaining the electrical means active to operate the drill.

In the accompanying drawings,

Figure 1 is a view showing another form of circuit controller embodying my invention in applied position with respect to a lens drilling machine.

Figure 2 is a detail, perspective View of a portion of the circuit controller shown in Figure 1.

Similar reference characters refer to similar parts in each of the views.

Referring specifically to the drawings and particularly to Figure 1, my invention in the present embodiment is shown as applied to a conventional form of lens drilling ma chine including a base 15 carrying a lens supporting table 16. Extending upwardly from the base 15 is a standard 17 provided with spaced bearing arms 18 in which is journaled a shaft 19 carrying a drill 20. The shaft is provided with a pulley 21 about which is trained an endless belt 22, the belt,

also engaging pulleys 23 supported on an arm 24. The machine as a unit is suitably secured at its base upon a working table 25 constituting a part of the cabinet 26 provided with a compartment below the table in which is arranged an' electric motor 27. The shaft of the motor 27 is provided with a pulley 28 about which the belt 22 is trained so that when the motor is energized the belt operates to effect rotation of the shaft 19;

The shaft 19 is also mounted for vertical movement within the bearings 18,'and its upper end is connected to a carriage 29 sustained for vertical movement upon the rod 30 slidably fitted to the upper end of the standard 17. This carriage is adapted to be manually adjusted to effect a vertical adjustment of the shaft 19, and for this purpose a lever 31 is fulcrumed at the point 32 and connected to the carriage through the medium of a link 33. The carriage is normally urged to the uppermost position shown in Figure 1 by means of a coiled expansible spring 34 surrounding the rod 30. Fro ithe foregoing arrangement it will be clea ki'that through the operation of the lever 31, the .drill 20 can be moved vertically 30 to engage or disengage a lens supported upon the table 16.

Referring now to Figurers 1 and 2, I have here shown a form of circuit controller em bodying my invention, which is adapted for 35 use in conjuncton with a lens drilling machine.

The circuit controller includes a rod 48 slidable through the table 25 and connected at its upper end to the carriage 49 by means of a metallic strap 29. The lower end of the rod- 48 is connected to what is virtually a bell crank lever, such lever being in the form of a single length of resilient wire bent to provide end portions 50 and 51 disposed at' right angles to each other and with respect to an intermediate portion 52, all as clearly shown in Figure 2. This lever is mounted for rocking movement attheunder side of the table 25 by means of a bearing bracket 53, the bracket rotatably receiving the intermediate portion 52 so that the portions 50 and 51 normally occupy horizontal and vertical positions. respectively.

The lower end of the rod 48 is connected net and through the porcelain base 57 of a switch. This switch includes a removable cover 58, and stationary contacts 59 secured on binding posts 60. A removable contact 61 is carried by the rod 56 through the medium of a connector 62 of insulating material which threadedly engages the rod, as clearly shown in Figure 1. A

screw 63 is employed for securing the Contact rod 48 thereby rocking the bell crank lever to advance the rod 56 and thus move the contact 61 into engagement with the contacts 59. With the switch closed, the motor'27 operates to'rotate the shaft 19. By virtue of the fact that the bell crank lever is formed of resilient wire, it is possible to move the carriage 29 to its lowermost position Without in any way distorting the circuit controller and still maintaining the contact 61 in bridging position with respect to the contacts 59.

It will thus be seen that the drill shaft 19 is continuously propelled during any of the adjusted positions of which it is capable of occupying. Of course, when the lever 31 is released, and the carriage returns toits uppermost position, the circuit controller is actuated to move the contact 61 out of engagement with the contacts 59 thereby energizing the motor 27.

lVhat I claim is:

1. A lens drilling machine comprising a bench, a standard mounted upon the bench, spaced bearing arms extending horizontally from the standard, a drill shaft mounted vertically in the bearing arms and adapted to rotate and reciprocate and adapted to carry a drill, a carriage fixed upon the upper end of the shaft, a rod fixed to the carriage and reciprocating through .the upper bearing arm, a spring upon the rod between the bearing arm and carriage, a hand lever pivoted to the standard and connected to the rod for reciprocating the drill shaft, a motor mounted under the bench, means to rotate the drill spindle from the motor, and means whereby the motor circuit is closed when the drill shaft moves towards work and open when the drill shaft moves away from work. I

2. A lens drilling machine comprising a bench, a standard mounted upon the bench, spaced bearing arms extending horizontally from the standard, a drill shaft mounted vertically in the bearing arms and adapted to rotate and reciprocate and adapted to carry a drill, a carriage fixed upon the upper end of the shaft, a rod fixed to the carriage and reciprocating through the upper bearing arm, a spring upon t e rod between the bearing arm and carriage, a hand. lever pivoted to the standard and connected to the rod for reciprocating the drill shaft, a motor mounted under the bench, means to rotate the drill spindle from the motor, a strap fixed upon the carriage and extending laterally to a position behind the standard, a rod connected to the strap and extending downwardlyback of the standard through the bench, an opposite yielding bell crank lever mounted upon the lower face of the table and having one end connected to the lower end of the rod and a circuit breaker connected to the other end of the bell crank lever and incorporated into the motor circuit so that when the drill shaft is moved downwardly towards work the circuit is closed and when the drill shaft is moved upwardly the circuit is open.

In testimony whereof I have signed my name to this specification.

- EVERETT E. GRAY. 

